EditorialA photo provided by NASA/JPL shows Neptune and its Great Dark Spot, as captured by the Voyager 2 spacecraft in 1989. (NASA/JPL via The New York Times)
EditorialA photo provided by NASA/JPL shows Neptune and its Great Dark Spot, as captured by the Voyager 2 spacecraft in 1989. (NASA/JPL via The New York Times)
EditorialImages provided by NASA show Uranus, left, and Neptune during flybys of NASA’s Voyager 2 spacecraft in the 1980s. (NASA/JPL-Caltech/B. Jónsson via The New York Times)